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avcodec/mjpegdec: Check for multiple exif

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Fixes: memleak
Fixes: 477993717/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AMV_DEC_fuzzer-4515108431921152

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2026-02-10 21:00:15 +01:00
parent 2ab23ec729
commit 302f198ba5
1 changed files with 5 additions and 0 deletions
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5
libavcodec/mjpegdec.c
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@@ -2036,6 +2036,11 @@ static int mjpeg_decode_app(MJpegDecodeContext *s, int start_code)
bytestream2_skipu(&s->gB, 2); // skip padding
len -= 2;
if (s->exif_metadata.entries) {
av_log(s->avctx, AV_LOG_WARNING, "multiple EXIF\n");
goto out;
}
ret = av_exif_parse_buffer(s->avctx, s->gB.buffer, len, &s->exif_metadata, AV_EXIF_TIFF_HEADER);
if (ret < 0) {
av_log(s->avctx, AV_LOG_WARNING, "unable to parse EXIF buffer\n");